Plane is an open-source project management tool. Prior to 1.4.0, an authenticated low-privilege workspace member, including a Guest, can upload an image/svg+xml file as a generic or issue attachment. The file retains the attacker-controlled Content-Type, and the asset-download endpoint creates a presigned URL with Content-Disposition: inline.
In the default self-hosted MinIO deployment, the asset URL is served from the same origin as the Plane application, allowing embedded SVG JavaScript to execute in the application's security context. A victim, including a workspace administrator, who opens the link can have the session compromised through stored XSS, leading to account takeover. This issue is fixed in 1.4.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
makeplane:plane
References 4
https://github.com/makeplane/plane/security/advisories/GHSA-ch8j-vr4r-qf6h
https://github.com/makeplane/plane/security/advisories/GHSA-ch8j-vr4r-qf6h
https://github.com/makeplane/plane/pull/9312
https://github.com/makeplane/plane/pull/9312
https://github.com/makeplane/plane/commit/9dff20e04808286acb372119d88c666b802b1…
https://github.com/makeplane/plane/commit/9dff20e04808286acb372119d88c666b802b1d50
https://github.com/makeplane/plane/releases/tag/v1.4.0
https://github.com/makeplane/plane/releases/tag/v1.4.0